-LRB- CNN -RRB- -- Defending Wimbledon champion Novak Djokovic has been named as the top men 's seed for this year 's tournament , with French Open winner Maria Sharapova heading the women 's singles seedings .

World number one Djokovic retains the top seeding at the All England Club despite his defeat to Rafael Nadal in the French Open final earlier this month .

The Spaniard is seeded second ahead of six-time champion Roger Federer , who is seeking a first grand slam win since the 2010 Australian Open .

Great Britain 's Andy Murray , a losing semifinalist for the last three years , is seeded fourth .

However , the Scot 's preparations suffered a blow on Wednesday when he was beaten by Janko Tipsarevic at The Boodles exhibition tournament in Buckinghamshire .

It was Murray 's second successive defeat on grass , following his surprise early exit from the Aegon Championships at Queen 's Club last week .

France 's Jo-Wilfried Tsonga , who suffered an injury scare when he injured a finger at the Aegon Championships , is seeded fifth for Wimbledon .

He will not be joined by fellow Frenchman Gael Monfils as the world number 15 has failed to recover from a knee injury in time for the championships .

The Wimbledon women 's singles seedings reflect the current WTA Tour rankings , with world number one Sharapova selected top .

She is followed by world number two Victoria Azarenka of Belarus and Poland 's Agnieszka Radwanska , with reigning Wimbledon champion Petra Kvitova seeded fourth .

Australia 's Sam Stosur is the fifth seed , with four-time Wimbledon champion Serena Williams seeded sixth .

Meanwhile , two-time Wimbledon champion Nadal was named as the flag carrier for Spain at the London 2012 Olympics on Wednesday .

Sharapova and Djokovic were handed similar roles for Russia and Serbia respectively earlier this month .

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Champion Novak Djokovic is top men 's seed for Wimbledon

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Serbian is ahead of Rafael Nadal and Roger Federer

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Fourth seed Andy Murray loses warmup match

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Maria Sharapova is top seed in women 's singles , with Serena Williams sixth